Results 221 to 230 of about 8,952 (260)

A comparison of radiation dose measured in CT dosimetry phantoms with calculations using EGS4 and voxel-based computational models

Physics in Medicine and Biology, 1997
CT is a high-dose examination and possibly the dominant contributor to dose from diagnostic radiology. Estimates of organ doses are obtained from Monte Carlo calculations and used to quantify radiation risk. To ensure the validity of using Monte Carlo calculations to estimate actual dose, measurements must be compared with calculations.
M, Caon, G, Bibbo, J, Pattison
openaire   +4 more sources

SAR in a child voxel phantom from exposure to wireless computer networks (Wi-Fi)

Physics in Medicine and Biology, 2010
Specific energy absorption rate (SAR) values have been calculated in a 10 year old sitting voxel model from exposure to electromagnetic fields at 2.4 and 5 GHz, frequencies commonly used by Wi-Fi devices. Both plane-wave exposure of the model and irradiation from antennas in the near field were investigated for a variety of exposure conditions.
R P, Findlay, P J, Dimbylow
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Dosimetric Impact of a New Computational Voxel Phantom Series for the Japanese Atomic Bomb Survivors: Pregnant Females

Radiation Research, 2019
An important cohort of the atomic bomb survivors are women who were pregnant when exposed to the photon and neutron fields at both Hiroshima and Nagasaki, as well as their children who were exposed in utero. Estimates of organ dose to the developing fetus allow for the development of dose-dependent and gestational age-dependent models of deterministic (
Colin, Paulbeck, Keith, Griffin, Choonsik, Lee, Harry, Cullings, Stephen D, Egbert, Sachiyo, Funamoto, Tatsuhiko, Sato, Akira, Endo, Nolan, Hertel, Wesley E, Bolch   +9 more
openaire   +2 more sources

161 DEVELOPING COMPUTATIONAL METHODS TO VIEW DISTRIBUTIONS OF SECOND CANCER RISK USING MONTE CARLO AND VOXEL HUMAN PHANTOMS

Radiotherapy and Oncology, 2012
Purpose: Carcinoma-Associated Fibroblasts (CAFs) are major components of solid malignancies and play central roles in cancer sustainability. In this study we have investigated the invasive capacity and matrix remodelling properties of human lung CAFs after exposure to ablative doses of ionizing radiation (IR), corresponding to fractions delivered by ...
W. Alsaleh, R. Hugtenburg
openaire   +1 more source

Dosimetric Impact of a New Computational Voxel Phantom Series for the Japanese Atomic Bomb Survivors: Methodological Improvements and Organ Dose Response Functions

Radiation Research, 2020
Owing to recent advances in computational dosimetry tools, an update is warranted for the dosimetry system for atomic bomb survivors that was established by the Joint U.S.Japan Working Group on the Reassessment of Atomic Bomb Dosimetry in 2002 (DS02). The DS02 system, and its predecessor, DS86, at the Radiation Effects Research Foundation (RERF), are ...
Tatsuhiko, Sato, Sachiyo, Funamoto, Colin, Paulbeck, Keith, Griffin, Choonsik, Lee, Harry, Cullings, Stephen D, Egbert, Akira, Endo, Nolan, Hertel, Wesley E, Bolch   +9 more
openaire   +2 more sources

Physical quality evaluation of voxel values in cone-beam computed tomography for dental use: three-dimensional fluctuation of voxel values in uniform materials placed inside a phantom

Oral Radiology, 2014
Objectives The aim of this study was to reveal the three-dimensional fluctuation of voxel values in a uniform material placed inside a phantom simulating a human head when it was scanned with cone-beam computed tomography (CBCT) for dental use.
Yoshikazu Nomura, Hiroshi Watanabe, Yosuke Kamiyama, Tohru Kurabayashi   +3 more
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A Voxel Phantom Based Monte Carlo Computer Program for Optimisation of Chest and Lumbar Spine X Ray Imaging Systems

Radiation Protection Dosimetry, 2000
A Monte Carlo computer model of X ray imaging systems has been developed which uses a voxel phantom to simulate the patient. Image details were selected in accordance with the European quality criteria document. Contrast and signal-to-noise ratio for these details were calculated to estimate image quality.
M. Sandborg, G. McVey, D.R. Dance, J. Persliden, G.A. Carlsson   +4 more
openaire   +1 more source

Entrance surface dose distribution and organ dose assessment for cone-beam computed tomography using measurements and Monte Carlo simulations with voxel phantoms

Radiation Physics and Chemistry, 2017
Abstract Cone-Beam Computed Tomography (CBCT) enables high-resolution volumetric scanning of the bone and soft tissue anatomy under investigation at the treatment accelerator. This technique is extensively used in Image Guided Radiation Therapy (IGRT) for pre-treatment verification of patient position and target volume localization.
M. Baptista, S. Di Maria, S. Vieira, P. Vaz   +3 more
openaire   +1 more source

SU‐E‐I‐02: A Framework to Perform Batch Simulations of Computational Voxel Phantoms to Study Organ Doses in Computed Tomography Using a Commercial Monte Carlo Software Package

Medical Physics, 2014
Purpose:ImpactMC (CT Imaging, Erlangen, Germany) is a Monte Carlo (MC) software package that offers a GPU enabled, user definable and validated method for 3D dose distribution calculations for radiography and Computed Tomography (CT). ImpactMC, in and of itself, offers limited capabilities to perform batch simulations.
R Bujila, P Nowik, G Poludniowski
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IMPACT ON 141Ce, 144Ce, 95Zr, AND 90Sr BETA EMITTER DOSE COEFFICIENTS OF PHOTON AND ELECTRON SAFS CALCULATED WITH ICRP/ICRU REFERENCE ADULT VOXEL COMPUTATIONAL PHANTOMS

Health Physics, 2010
The current dose coefficients for internal dose assessment of occupationally exposed persons and the general public were derived using the methodology of the International Commission on Radiological Protection (ICRP), which is similar to the Medical Internal Radiation Dose (MIRD)-type methodology.
W B, Li, M, Zankl, H, Schlattl, N, Petoussi-Henss, K F, Eckerman, W E, Bolch, U, Oeh, C, Hoeschen   +7 more
openaire   +2 more sources